【单选题】在其著作Book of Optics中,()解释光线以圆锥形式投射到眼睛中。
【简答题】阅读理解。 This is a picture of Mr. Li's family. The man in the middle is Mr. Li. The woman is Mr. Li's wife. They have two sons. The child behind Mr. Li is Li Lei. He's thir. The other in front of Mrs...
【单选题】—Who is the man over there? Is it Mr. Li? —No, it _______ be him, Mr. Li has left for Hong Kong. [ ]
【单选题】—Look! The lights in the teachers' office are still on. Is Mr. Li working? —No. It _______ be Mr. Li. I saw him leave just now. [ ]
【简答题】This is s picture of Mr. Li’s family. The man in the middle is Mr. Li. The woman is Mrs. Li. They have two sons. The child behind Mr. Li is Li Lei. He’s thir. The other in front of Mrs. Li is Li M...
【判断题】中秋节的盛行始于宋朝,至明清时,已与春节齐名,成为我国的四大主要节日之一。